Fair Value Measurements (Details) (USD $)	12 Months Ended
	Apr. 28, 2010	Apr. 27, 2011
Assets:
Derivatives	$ 133,773,000	$ 115,705,000
Total assets at fair value	133,773,000	115,705,000
Liabilities:
Derivatives	36,036,000	43,007,000
Earn-out	0	45,325,000
Total liabilities at fair value	36,036,000	88,332,000
Fair Value Measurements (Textuals) [Abstract]
Interest rate on debt	7.125%	7.125%
Recognized non-cash asset write-offs	12,600,000
Level 1 [Member]
Assets:
Derivatives	0	0
Total assets at fair value	0	0
Level 1 [Member]
Liabilities:
Derivatives	0	0
Earn-out	0	0
Total liabilities at fair value	0	0
Level 2 [Member]
Assets:
Derivatives	133,773,000	115,705,000
Total assets at fair value	133,773,000	115,705,000
Level 2 [Member]
Liabilities:
Derivatives	36,036,000	43,007,000
Earn-out	0	0
Total liabilities at fair value	36,036,000	43,007,000
Level 3 [Member]
Assets:
Derivatives	0	0
Total assets at fair value	0	0
Level 3 [Member]
Liabilities:
Derivatives	0	0
Earn-out	0	45,325,000
Total liabilities at fair value	$ 0	$ 45,325,000